Full-waveform digital detection device

Abstract

The invention relates to a full-waveform digital detection device comprising a constant fraction timing module, a time digital conversion module, a data interface module and a data storage module. A leading-edge discriminator set and a lagging-edge discriminator set of the constant fraction timing module discriminates that amplitude ratio of voltage, at pulse leading edge and pulse lagging edge, and peak voltage is a series of point corresponding moments of certain values. By integrating the digital counting method and digital delay line interpolation method, the time digital conversion module converts time intervals between the first time and each of the rest time into digital values so as to acquire data, then the data is sent to the data storage module through the data interface module. Implementation of the time digital conversion module and the data interface module is facilitated on an FPGA (field programmable gate array). The full-waveform digital detection device has the advantages such as high precision, integration and low cost and is applicable to the three-dimensional imaging laser scanner.

Description

1. Technical field [0001] The invention relates to a full waveform digitized detection technology, in particular to a method for converting pulse waveform information into digital quantities of time intervals between a series of moments in which the ratio of the pulse amplitude to the pulse peak value is a constant value. 2. Background technology [0002] As a non-contact active measurement system, 3D imaging laser scanner is widely used in urban 3D model reconstruction, construction engineering, power grid engineering, highway tunnel measurement, forest detection, cultural relics protection and other fields. At present, the 3D imaging laser scanner mainly obtains the 3D point cloud data of the measured object by the pulse time-of-flight ranging method. High point cloud density, and the amplitude and width information of the echo can be obtained, so as to obtain the surface characteristics of the target, which can greatly improve the detection ability and scene applicability...

AI Technical Summary

Problems solved by technology

Since the width of the laser echo pulse is generally between tens and hundreds of nanoseconds, according to the sampling theorem, in order to restore the waveform, the sampling frequency of the A / D sampling circuit needs to reach hundreds of megahertz or even higher, and the amount of data obtained It is very large and requires a large-capacity memory with fast read and write speeds to match it, so the circuit is often complex, bulky and expensive, which limits its application in 3D imaging laser scanners

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